Cannot change the VirtualizationMode attached property on an ItemsControl after Measure is called on the ItemsHost panel.

Hi, what is this error?

Cannot change the VirtualizationMode attached property on an ItemsControl after Measure is called on the ItemsHost panel.

I set the following in my style file:

<Style TargetType="DataGrid" BasedOn="{StaticResource KvfFrameworkElement}"><Setter Property="VirtualizingStackPanel.VirtualizationMode" Value="Standard" />
...

while i'm in design time wpf designer throw this exception and I cant see my design window but the application run normally!

what shuld I do please help me...

Thank

Amin Mashayekhi